Named for lake near headwaters of Convict Creek. Type locality designated along west wall of canyon of Convict Creek about 0.5 mi north of Mildred Lake, Mount Morrison 15' quad, Sierra Nevada, CA. Extends northwestward 2.5 mi in discontinuous exposure to canyon of Laurel Creek and southeastward about 5 mi in continuous exposure to Big McGee Lake, about 1 mi south of quad boundary in Mount Abbot quad. Shown on geologic map as part of Bloody Mountain block. Consists chiefly of light- to dark-gray, fine-grained massive siliceous hornfels that weathers reddish brown. Thickness is about 750 ft west of Laurel Mountain; is about 1000 ft thick north of Lake Genevieve. Conformably overlies Mount Baldwin marble (new); gradationally underlies Lake Dorothy hornfels (new). Age is Pennsylvanian and/or Permian(?)[!] based on stratigraphic position. [note (?) is redundant here]

Source: GNU records (USGS DDS-6; Menlo GNULEX).